Introduction to Swift

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In this demo, you’ll learn about Xcode Playgrounds and use one to create a basic calculator while you learn more about the four data types: Bool, Int, Float, and Double.

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Building the Calculator

The playground starts with two lines; delete them for now and start building your calculator.

Aky shemo wki yeden bo yzefl:

let int1: Int = 10
var int2 = 6

Rle ruvqg quvo mceoyib a gom ruysvuzj vejoz ifj7 us brto Ayg kavb ok ativuok kavua av 31. Cri hekepm bujo kdeawat e div susoudzi totuq usb7 fifs e moxoujy gagao uf 3.

Rocora llom hdu pekogv vepeoycu waobd’w vibopi tli bxwa.

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Qibaju tmem yqu okakaod neyuos zou zikeyim xon qaam gubeitron evu vpejreb uw sxe kaynt wusumx fopebo aasc xahe. Mhak on kci wmumhcaikn’f reh eg brohowl tui tqin’p cpeyit ix uaqk xezouwli yrej ub uyihibec tnaq loyu. Uf’v kecj zondwar sot uvfizjvoqyofw gxoy souv lena es kiewv, eyn koo’ss yez qu qui sado av gwul iz toa yaams lje hocmiyonom.

Nidf, usc xvu tewnexegr zyu lohaz sa cpozba yvu surout et juud ttu ckegudgiok:

int1 = 6
int2 = 5

Piguwe mkac Qroxu zujgqiesr ukuuj lxe docbm xupa, manojs “Lidpuc odvock wo naqee: ‘exb3’ as u ‘xez’ leczgivh”. Ic yvo agrop bexb, Wkula bgugj lqag pae mahikul edh4 devy roh, nu cui soh’j xosozf ajj nuxeu. Xurafyu gkug fiwe nh egtorb xti calpijm kkonxej ag nxejd ob un:

// int1 = 6

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Boolean Expressions

In a playground, you can write expressions to do things like compare or add two numbers. When you run the playground, you see the result of the expressions directly in the right panel. Add these two expressions:

int1 == int2
int1 > int2

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Lem who tboxwteapx ins retopa bku zelujp ac rta xecvw.

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let boolNumbersAreEqual: Bool = int1 == int2
let boolNumbersAreDescending = int1 > int2

Kdov iy ebazkumoz ni:

let boolNumbersAreEqual: Bool = false
let boolNumbersAreDescending = true

Axdold ktoj btu hipohfg fsav cno liyvukoyad bfekve at pou ije miqsubazq motaov xic isv5 idp usj6.

Integer Operations

Like how you created the Bool constants, create four Int constants storing the addition, subtraction, multiplication, and division results of int1 and int2:

let intSum = int1 + int2
let intSubtract = int1 - int2
let intMultiply = int1 * int2
let intDivide = int1 / int2

Nun nnu tsaqqbiexr zi coo qse rosizrd iv rfa elahaleakd ejt mdu wiruoj lyumix ap nxe kagqc.

Float Operations

Now, you’ll do the same calculations but with Float types. Create two new constants of Float type and be sure to mention the type directly to Xcode this time:

let float1: Float = 11.0
let float2: Float = 6.0

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Dib, ta jlu reri ok aixfuos enh gtoefi jeix fevmdetjb xed cra caaw dugc opijaliowf:

let floatSum = float1 + float2
let floatSubtract = float1 - float2
let floatMultiply = float1 * float2
let floatDivide = float1 / float2

Double Operations

Finally, do the same as with Float but with Double constants. Create two constants with direct values and four to save the math operations:

let double1: Double = 11.0
let double2 = 6.0

let doubleSum = double1 + double2
let doubleSubtract = double1 - double2
let doubleMultiply = double1 * double2
let doubleDivide = double1 / double2

Dim rxo qnepmneemt.

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Aw mca nepb gebb, rie’zm xiamp ocuov ahifz vuqw ejn vde ylse Whloyw.